Core for molds



May 31,1927. 1,630,357 H. (I. PFEIL CORE FOR MOLDS Filed May 23, 1925 jwezzzfor Patented May 31, 1927.

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HENRY o.-1=FnIL;"or o rrroAGo HEIGHTS, InLINors; ass'renon T0 nrannroan MAN- GANESE STEEL, COMPANY; on CHICAGQ-I-LLIHOIS, noonronarron or MAINE.

cons: roe MOLDS.

' Application filed May 23, 1925. seria no. 32,254; i

This invention relates to a novel construction of core for molds, for instance, sand, .molds, and has for its object to provide a a core construction which will insure accurate sustention of the core in its intended position 5 in those situations where, by reason of the location of a riser-or other space in the mold,

the sand or vmold substance is necessarily omitted to an extent which would otherwise 5 leave'the core inadequately supported and therefore subject to displacement which,

however slight, is seriously objectionable, particularly when the core is employed for forming the bore of a wheel or other object requiring accurate centering, and still more particularly where theob ect is being cast, of manganese steel, the finishing of which I must be accomplished by grinding, which would be both diiiicult. and expensive, and would beprohibitive if relied upon to insure centering of a bore. a

It has been proposed to employ wires or other makeshift; anchoring means for holding theend of a core awayfrom the riser space or other cut-away portion in the mold, but this method is both time consuming and unreliable. The present invention proceeds upon the principle of equipping the core itself with protruding portions with integral projections or sand-engaging portions located to enter the sand of the mold in directions approximately transverse to that in which the coreis liable to tip, and at points on the core sufficiently back from the space or point of weakened support, to firmly embed the core and thus insure its correct upstanding position even though the mold material on one side of the core may be largely removed. The impairment ofcore support which the present invention seeks to meet usually occurs at one end of the core, for in i stance, in the cope section of the mold, and the core supporting projections, While located to enter the cope, will extend to the dividing plane ofthe mold sections so as to leave their impressions as a part of the cope section core print; and in order to insure introduction of the core in the drag section in position to bring the supporting projections into registry with their cope section prints,

the lower end of the core, as well as the print which receives it, is suitably deformed from a circular section so that the'p'rint will be received in but one position.

In order that the invention may be fully ctruing up the bore.

iniderstood, the preferred embodiment theredrawing, J in c which Y mold minus its pattern and a core e1nbodying. the subject-matter of the present invention, theiplaneof section being through the center of the mold and the pouring runner. Figure 2 is a plan view of parts shownin Figurel with the cope section of the mold removed. V 1' Figure 3 isa'detail elevational view ottlie core as seen from the right of Figureslland 2, and on an enlarged scale.

Figure; iis atop plan view and lligure 5 equipped with a section of tubing which is of the core;

,. to beleft asa liner in the casting. i V

,lrepresents the drag section, 2 the cope sect1on, 3 the casting cavity, and 4 the core ina mold which is typical of ordinary toun dry practice, forinstance a mold used in castii'ig a wheel 'iIn foundry worko'f this kind, it is common to connect the pouring runner o to the lower portionof the mold avlty, and to leave one or more spaces 6 in which the metal may rise after filling the mold cavity, to vent the mold, carry 05 scum, andinsure a solid casting. When a riser space 6 is located adjacenta core, such as shown at 4, it seriously impairs lateral ot has. been illustrated in theaccompanying is a sidefelevation 'o fjthe'core i support forthe upper end of a core and leaves thelatter subject to displacement by thelnrushing metal, with the result that a bore or opening which should accurately correspond with the geometrical center of the casting is so far out of center as to necessitate either discard of the casting or. ex-

penditure of an undue amount of time in In ordinary carbon steel work it is comparatively easy to true a'bore in the lathe, and the preferable practice'is to use a, reduced size of core and dress theopening to bring it to proper size and condition. But this is not practicable in manganese steel work, since the cast object can be tooled and finished only by grinding 1 Now, the present invention insures such accuracy in the location of the bore of the casting as will admit of the bore being originally produced with its desired ultimate dimension, and this is accomplished by providing'the core 4 with projections such as other than correct position.

shown at 7 located to embed themselves 'in the sand approximately transversely to the direction of tipping tendency, andsufliciently :farback from the riser space to insure ade quate support and r gld sustention of thecore under all displacing influences which it is liable to encounter. Projections"? are preferably located on the opposite sides of the medial plane of the 'co re from the riser space 6, but not so far to the rear thereof as will reduce their area of connection With the core. Prints for the ends of the core 4 l1avlng been accurately located in the drag and cope" sections or themold, and in order to enforce presentatlo-n of the core 1n exact pOS1l31Qn,',th Lt is to say at a predetermined angle of revolution, and insure registry of projections 7 With their impr nts, the bottom ration into cope and clrag'sections, a core crossing the plane of separation and having its respective ends projecting into the tWo sections, said core being constructed with transverse projections embedded in the material of a mold section and sustaining the core against tipping.

2. In a mold, mold sections, acore sup- 7 I l 1 t day f May; 1925? ported by its ends in the respective mold sections, one of said mold sections having 3. The combination of mold divided by a plane of separation into sections, a core crossing the plane ofseparation and having its respective ends embedded in said mold sect1ons,one oi said sect ons being recessed ad acentthe end of the core Which t re- 'ceive's, "and said "core being provided, at its end which enters the recessed mold section,

its other end deformed to insure its introduction into the mold section Which receives it at a predetermined angle of revolution.

I l. core tor'miolds, having its ends constructed to enter core prints in a pair t with projections embedded the'mold sub- .st'anceto one side of the recess and having moldse'ctio-nsf-one' of the ends of the core being formed with transverse projections in position to. embed themselves in the Walls of the 'core print which receives [said end.

x 5; A core for molds, having its ends con-' struct edto enter core prints-in a pair of mold sections, one of theends of the core being formed Wi-th'transverse projections in josit ion to embed themselves in the Walls of "the core print which receives said end; said ])lO]Ct10IlS- being both onone side of a inedialaxial plane of the "core.

Signed at ChicagoHeights,Illinois, this N Y o. PFEIL. 

